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| author | Peter Oberparleiter <peter.oberparleiter@de.ibm.com> | 2006-04-10 22:53:47 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-04-11 06:18:38 -0700 |
| commit | 25ee4cf831fcc2855927c175d246a25e5ebe5902 (patch) | |
| tree | 8338c521644eef239912230543fafbdaa1eee22e /drivers/s390/block | |
| parent | dafd87aaef7d95a6ad3ff92e0d512e5b166c0716 (diff) | |
| download | blackbird-op-linux-25ee4cf831fcc2855927c175d246a25e5ebe5902.tar.gz blackbird-op-linux-25ee4cf831fcc2855927c175d246a25e5ebe5902.zip | |
[PATCH] s390: fail-fast requests on quiesced devices
Using the fail-fast flag in i/o requests on a dasd disk which has been
quiesced leads to kernel panics. Modify the request start function to only
work on requests in a valid state.
Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/s390/block')
| -rw-r--r-- | drivers/s390/block/dasd.c | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 170aae004ceb..a3bfebcf31ef 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -1257,25 +1257,28 @@ __dasd_start_head(struct dasd_device * device) if (list_empty(&device->ccw_queue)) return; cqr = list_entry(device->ccw_queue.next, struct dasd_ccw_req, list); - /* check FAILFAST */ + if (cqr->status != DASD_CQR_QUEUED) + return; + /* Non-temporary stop condition will trigger fail fast */ if (device->stopped & ~DASD_STOPPED_PENDING && test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) && (!dasd_eer_enabled(device))) { cqr->status = DASD_CQR_FAILED; dasd_schedule_bh(device); + return; } - if ((cqr->status == DASD_CQR_QUEUED) && - (!device->stopped)) { - /* try to start the first I/O that can be started */ - rc = device->discipline->start_IO(cqr); - if (rc == 0) - dasd_set_timer(device, cqr->expires); - else if (rc == -EACCES) { - dasd_schedule_bh(device); - } else - /* Hmpf, try again in 1/2 sec */ - dasd_set_timer(device, 50); - } + /* Don't try to start requests if device is stopped */ + if (device->stopped) + return; + + rc = device->discipline->start_IO(cqr); + if (rc == 0) + dasd_set_timer(device, cqr->expires); + else if (rc == -EACCES) { + dasd_schedule_bh(device); + } else + /* Hmpf, try again in 1/2 sec */ + dasd_set_timer(device, 50); } /* |
